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linux-sg2042/drivers/parport/parport_sunbpp.c

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/* parport_sunbpp.c: Parallel-port routines for SBUS
*
* Author: Derrick J. Brashear <shadow@dementia.org>
*
* based on work by:
* Phil Blundell <philb@gnu.org>
* Tim Waugh <tim@cyberelk.demon.co.uk>
* Jose Renau <renau@acm.org>
* David Campbell <campbell@tirian.che.curtin.edu.au>
* Grant Guenther <grant@torque.net>
* Eddie C. Dost <ecd@skynet.be>
* Stephen Williams (steve@icarus.com)
* Gus Baldauf (gbaldauf@ix.netcom.com)
* Peter Zaitcev
* Tom Dyas
*
* Updated to new SBUS device framework: David S. Miller <davem@davemloft.net>
*
*/
#include <linux/string.h>
#include <linux/module.h>
#include <linux/delay.h>
#include <linux/errno.h>
#include <linux/ioport.h>
#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/init.h>
#include <linux/parport.h>
#include <asm/ptrace.h>
#include <linux/interrupt.h>
#include <asm/io.h>
#include <asm/oplib.h> /* OpenProm Library */
#include <asm/sbus.h>
#include <asm/dma.h> /* BPP uses LSI 64854 for DMA */
#include <asm/irq.h>
#include <asm/sunbpp.h>
#undef __SUNBPP_DEBUG
#ifdef __SUNBPP_DEBUG
#define dprintk(x) printk x
#else
#define dprintk(x)
#endif
static irqreturn_t parport_sunbpp_interrupt(int irq, void *dev_id)
{
parport_generic_irq(irq, (struct parport *) dev_id);
return IRQ_HANDLED;
}
static void parport_sunbpp_disable_irq(struct parport *p)
{
struct bpp_regs __iomem *regs = (struct bpp_regs __iomem *)p->base;
u32 tmp;
tmp = sbus_readl(&regs->p_csr);
tmp &= ~DMA_INT_ENAB;
sbus_writel(tmp, &regs->p_csr);
}
static void parport_sunbpp_enable_irq(struct parport *p)
{
struct bpp_regs __iomem *regs = (struct bpp_regs __iomem *)p->base;
u32 tmp;
tmp = sbus_readl(&regs->p_csr);
tmp |= DMA_INT_ENAB;
sbus_writel(tmp, &regs->p_csr);
}
static void parport_sunbpp_write_data(struct parport *p, unsigned char d)
{
struct bpp_regs __iomem *regs = (struct bpp_regs __iomem *)p->base;
sbus_writeb(d, &regs->p_dr);
dprintk((KERN_DEBUG "wrote 0x%x\n", d));
}
static unsigned char parport_sunbpp_read_data(struct parport *p)
{
struct bpp_regs __iomem *regs = (struct bpp_regs __iomem *)p->base;
return sbus_readb(&regs->p_dr);
}
#if 0
static void control_pc_to_sunbpp(struct parport *p, unsigned char status)
{
struct bpp_regs __iomem *regs = (struct bpp_regs __iomem *)p->base;
unsigned char value_tcr = sbus_readb(&regs->p_tcr);
unsigned char value_or = sbus_readb(&regs->p_or);
if (status & PARPORT_CONTROL_STROBE)
value_tcr |= P_TCR_DS;
if (status & PARPORT_CONTROL_AUTOFD)
value_or |= P_OR_AFXN;
if (status & PARPORT_CONTROL_INIT)
value_or |= P_OR_INIT;
if (status & PARPORT_CONTROL_SELECT)
value_or |= P_OR_SLCT_IN;
sbus_writeb(value_or, &regs->p_or);
sbus_writeb(value_tcr, &regs->p_tcr);
}
#endif
static unsigned char status_sunbpp_to_pc(struct parport *p)
{
struct bpp_regs __iomem *regs = (struct bpp_regs __iomem *)p->base;
unsigned char bits = 0;
unsigned char value_tcr = sbus_readb(&regs->p_tcr);
unsigned char value_ir = sbus_readb(&regs->p_ir);
if (!(value_ir & P_IR_ERR))
bits |= PARPORT_STATUS_ERROR;
if (!(value_ir & P_IR_SLCT))
bits |= PARPORT_STATUS_SELECT;
if (!(value_ir & P_IR_PE))
bits |= PARPORT_STATUS_PAPEROUT;
if (value_tcr & P_TCR_ACK)
bits |= PARPORT_STATUS_ACK;
if (!(value_tcr & P_TCR_BUSY))
bits |= PARPORT_STATUS_BUSY;
dprintk((KERN_DEBUG "tcr 0x%x ir 0x%x\n", regs->p_tcr, regs->p_ir));
dprintk((KERN_DEBUG "read status 0x%x\n", bits));
return bits;
}
static unsigned char control_sunbpp_to_pc(struct parport *p)
{
struct bpp_regs __iomem *regs = (struct bpp_regs __iomem *)p->base;
unsigned char bits = 0;
unsigned char value_tcr = sbus_readb(&regs->p_tcr);
unsigned char value_or = sbus_readb(&regs->p_or);
if (!(value_tcr & P_TCR_DS))
bits |= PARPORT_CONTROL_STROBE;
if (!(value_or & P_OR_AFXN))
bits |= PARPORT_CONTROL_AUTOFD;
if (!(value_or & P_OR_INIT))
bits |= PARPORT_CONTROL_INIT;
if (value_or & P_OR_SLCT_IN)
bits |= PARPORT_CONTROL_SELECT;
dprintk((KERN_DEBUG "tcr 0x%x or 0x%x\n", regs->p_tcr, regs->p_or));
dprintk((KERN_DEBUG "read control 0x%x\n", bits));
return bits;
}
static unsigned char parport_sunbpp_read_control(struct parport *p)
{
return control_sunbpp_to_pc(p);
}
static unsigned char parport_sunbpp_frob_control(struct parport *p,
unsigned char mask,
unsigned char val)
{
struct bpp_regs __iomem *regs = (struct bpp_regs __iomem *)p->base;
unsigned char value_tcr = sbus_readb(&regs->p_tcr);
unsigned char value_or = sbus_readb(&regs->p_or);
dprintk((KERN_DEBUG "frob1: tcr 0x%x or 0x%x\n", regs->p_tcr, regs->p_or));
if (mask & PARPORT_CONTROL_STROBE) {
if (val & PARPORT_CONTROL_STROBE) {
value_tcr &= ~P_TCR_DS;
} else {
value_tcr |= P_TCR_DS;
}
}
if (mask & PARPORT_CONTROL_AUTOFD) {
if (val & PARPORT_CONTROL_AUTOFD) {
value_or &= ~P_OR_AFXN;
} else {
value_or |= P_OR_AFXN;
}
}
if (mask & PARPORT_CONTROL_INIT) {
if (val & PARPORT_CONTROL_INIT) {
value_or &= ~P_OR_INIT;
} else {
value_or |= P_OR_INIT;
}
}
if (mask & PARPORT_CONTROL_SELECT) {
if (val & PARPORT_CONTROL_SELECT) {
value_or |= P_OR_SLCT_IN;
} else {
value_or &= ~P_OR_SLCT_IN;
}
}
sbus_writeb(value_or, &regs->p_or);
sbus_writeb(value_tcr, &regs->p_tcr);
dprintk((KERN_DEBUG "frob2: tcr 0x%x or 0x%x\n", regs->p_tcr, regs->p_or));
return parport_sunbpp_read_control(p);
}
static void parport_sunbpp_write_control(struct parport *p, unsigned char d)
{
const unsigned char wm = (PARPORT_CONTROL_STROBE |
PARPORT_CONTROL_AUTOFD |
PARPORT_CONTROL_INIT |
PARPORT_CONTROL_SELECT);
parport_sunbpp_frob_control (p, wm, d & wm);
}
static unsigned char parport_sunbpp_read_status(struct parport *p)
{
return status_sunbpp_to_pc(p);
}
static void parport_sunbpp_data_forward (struct parport *p)
{
struct bpp_regs __iomem *regs = (struct bpp_regs __iomem *)p->base;
unsigned char value_tcr = sbus_readb(&regs->p_tcr);
dprintk((KERN_DEBUG "forward\n"));
value_tcr &= ~P_TCR_DIR;
sbus_writeb(value_tcr, &regs->p_tcr);
}
static void parport_sunbpp_data_reverse (struct parport *p)
{
struct bpp_regs __iomem *regs = (struct bpp_regs __iomem *)p->base;
u8 val = sbus_readb(&regs->p_tcr);
dprintk((KERN_DEBUG "reverse\n"));
val |= P_TCR_DIR;
sbus_writeb(val, &regs->p_tcr);
}
static void parport_sunbpp_init_state(struct pardevice *dev, struct parport_state *s)
{
s->u.pc.ctr = 0xc;
s->u.pc.ecr = 0x0;
}
static void parport_sunbpp_save_state(struct parport *p, struct parport_state *s)
{
s->u.pc.ctr = parport_sunbpp_read_control(p);
}
static void parport_sunbpp_restore_state(struct parport *p, struct parport_state *s)
{
parport_sunbpp_write_control(p, s->u.pc.ctr);
}
static struct parport_operations parport_sunbpp_ops =
{
.write_data = parport_sunbpp_write_data,
.read_data = parport_sunbpp_read_data,
.write_control = parport_sunbpp_write_control,
.read_control = parport_sunbpp_read_control,
.frob_control = parport_sunbpp_frob_control,
.read_status = parport_sunbpp_read_status,
.enable_irq = parport_sunbpp_enable_irq,
.disable_irq = parport_sunbpp_disable_irq,
.data_forward = parport_sunbpp_data_forward,
.data_reverse = parport_sunbpp_data_reverse,
.init_state = parport_sunbpp_init_state,
.save_state = parport_sunbpp_save_state,
.restore_state = parport_sunbpp_restore_state,
.epp_write_data = parport_ieee1284_epp_write_data,
.epp_read_data = parport_ieee1284_epp_read_data,
.epp_write_addr = parport_ieee1284_epp_write_addr,
.epp_read_addr = parport_ieee1284_epp_read_addr,
.ecp_write_data = parport_ieee1284_ecp_write_data,
.ecp_read_data = parport_ieee1284_ecp_read_data,
.ecp_write_addr = parport_ieee1284_ecp_write_addr,
.compat_write_data = parport_ieee1284_write_compat,
.nibble_read_data = parport_ieee1284_read_nibble,
.byte_read_data = parport_ieee1284_read_byte,
.owner = THIS_MODULE,
};
static int __devinit init_one_port(struct sbus_dev *sdev)
{
struct parport *p;
/* at least in theory there may be a "we don't dma" case */
struct parport_operations *ops;
void __iomem *base;
int irq, dma, err = 0, size;
struct bpp_regs __iomem *regs;
unsigned char value_tcr;
irq = sdev->irqs[0];
base = sbus_ioremap(&sdev->resource[0], 0,
sdev->reg_addrs[0].reg_size,
"sunbpp");
if (!base)
return -ENODEV;
size = sdev->reg_addrs[0].reg_size;
dma = PARPORT_DMA_NONE;
ops = kmalloc(sizeof(struct parport_operations), GFP_KERNEL);
if (!ops)
goto out_unmap;
memcpy (ops, &parport_sunbpp_ops, sizeof (struct parport_operations));
dprintk(("register_port\n"));
if (!(p = parport_register_port((unsigned long)base, irq, dma, ops)))
goto out_free_ops;
p->size = size;
if ((err = request_irq(p->irq, parport_sunbpp_interrupt,
IRQF_SHARED, p->name, p)) != 0) {
goto out_put_port;
}
parport_sunbpp_enable_irq(p);
regs = (struct bpp_regs __iomem *)p->base;
value_tcr = sbus_readb(&regs->p_tcr);
value_tcr &= ~P_TCR_DIR;
sbus_writeb(value_tcr, &regs->p_tcr);
printk(KERN_INFO "%s: sunbpp at 0x%lx\n", p->name, p->base);
dev_set_drvdata(&sdev->ofdev.dev, p);
parport_announce_port(p);
return 0;
out_put_port:
parport_put_port(p);
out_free_ops:
kfree(ops);
out_unmap:
sbus_iounmap(base, size);
return err;
}
static int __devinit bpp_probe(struct of_device *dev, const struct of_device_id *match)
{
struct sbus_dev *sdev = to_sbus_device(&dev->dev);
return init_one_port(sdev);
}
static int __devexit bpp_remove(struct of_device *dev)
{
struct parport *p = dev_get_drvdata(&dev->dev);
struct parport_operations *ops = p->ops;
parport_remove_port(p);
if (p->irq != PARPORT_IRQ_NONE) {
parport_sunbpp_disable_irq(p);
free_irq(p->irq, p);
}
sbus_iounmap((void __iomem *) p->base, p->size);
parport_put_port(p);
kfree(ops);
dev_set_drvdata(&dev->dev, NULL);
return 0;
}
static struct of_device_id bpp_match[] = {
{
.name = "SUNW,bpp",
},
{},
};
MODULE_DEVICE_TABLE(of, bpp_match);
static struct of_platform_driver bpp_sbus_driver = {
.name = "bpp",
.match_table = bpp_match,
.probe = bpp_probe,
.remove = __devexit_p(bpp_remove),
};
static int __init parport_sunbpp_init(void)
{
return of_register_driver(&bpp_sbus_driver, &sbus_bus_type);
}
static void __exit parport_sunbpp_exit(void)
{
of_unregister_driver(&bpp_sbus_driver);
}
MODULE_AUTHOR("Derrick J Brashear");
MODULE_DESCRIPTION("Parport Driver for Sparc bidirectional Port");
MODULE_SUPPORTED_DEVICE("Sparc Bidirectional Parallel Port");
MODULE_VERSION("2.0");
MODULE_LICENSE("GPL");
module_init(parport_sunbpp_init)
module_exit(parport_sunbpp_exit)
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